adjective
nightmarish
adjective
1
Extremely unpleasant, frightening, or stressful, like a nightmare.
"The traffic on the way to the airport was nightmarish."
How to Use Nightmarish
Learner’s notesIn plain EnglishSo bad or frightening it resembles a nightmare.
Word Forms
more nightmarish comparative, most nightmarish superlative
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The traffic on the way to the airport was _____.
Etymology
From nightmare + -ish.